K. J. Smith

Production andβDecay ofrp-Process NucleiCd96,In98, andSn100

The beta-decay properties of the N=Z nuclei 96Cd, 98In, and 100Sn have been studied. These nuclei were produced at the National Superconducting Cyclotron Laboratory by fragmenting a 120 MeV/nucleon 112Sn primary beam on a Be target. The resulting radioactive beam was filtered in the A1900 and the newly commissioned Radio Frequency Fragment Separator to achieve a purity level suitable for decay studies. The observed production cross sections of these nuclei are lower than predicted by factors of 10-30. The half-life of 96Cd, which was the last experimentally unknown waiting point half-life of the astrophysical rp process, is 1.03_{-0.21};{+0.24} s. The implications of the experimental T_{1/2} value of 96Cd on the abundances predicted by rp process calculations and the origin of A=96 isobars such as 96Ru are explored.

Dirac, dynamic information retrieval of atomic codes: 1. Physical design criteria

Abstract This communication describes a computer code, acronym DIRAC, to assist atomic physicists to control and process a library of computer codes. The objectives of DIRAC are to facilitate the preparation of input, the storage of output within the computers memory hierarchy, and the comparative analysis of results of the codes from the library. At the present time, the library consists of codes for calculating electron and photon processes in atomic systems with L - S coupling. Library members can used to identify and store experimental results. The DIRAC system is based on the availability of an interactive graphics device and has been implemented on IBM-2250s attached to either the IBM System 360/65 of 360/91.